Rab Mythic Ultra 20 vs Sea to Summit Ember XT 0°C Sleeping Bag
Weight and specs compared for 2026 — and which one to choose.
20-degree sleeping bag weighing 440g. Features TILT lining technology that reflects heat back to achieve superior warmth-to-weight ratio.
Full details →Ultralight 0°C rated bag with 850+ UltraDry Down insulation. Stretch-knit lining and sculpted hood for packability and comfort.
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Rab Mythic Ultra 20 vs Sea to Summit Ember XT 0°C Sleeping Bag: which should you buy?
If saving weight is your priority, the Rab Mythic Ultra 20 wins — at 440 g it is 169 g (28%) lighter than the Sea to Summit Ember XT 0°C Sleeping Bag (609 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.
See where both rank against everything else in this category on the lightest sleep system page, or browse the full gear weight database.